One firefighter was injured Tuesday afternoon while crews tackled a two-alarm Capitol Hill fire at a historic mansion just blocks from Volunteer Park.

Several streets in the area were shut down.

Crews were called to the PRAG House, a housing cooperative, in the 700 block of 16th Avenue East at 12:15 p.m. Six residents and a dog evacuated safely.

Firefighters arrived to find heavy smoke emanating from the attic. They cut open the attic and released plumes of black smoke.

Because of the warm weather and the heavy smoke, crews called a second alarm to bring more personnel to the scene, Seattle Fire Department spokesman Kyle Moore said. At least 30 fire units and about 90 firefighters were called to the scene.

A firefighter injured his neck during the operation after some material fell on him, Moore said.

The fire is now under control, but crews are still digging out charred wood in the attic. The blaze was contained to the attic space.

The fire investigator determined the cause of the fire was accidental, set by workers using a grinder. The blaze caused $1.25 million in damage to the structure and its contents. The Red Cross will assist thirteen people and a dog displaced by the fire.

The mansion, part of the Evergreen Land Trust, has housed a communal living community since 1976.